Add a file for scandir to find, but use gdb to remove it before it
gets indexed.

---

v2: Apparently our test setup is clever enough to gracefully handle
missing prerequisites, and ignore subtest results. Just make sure we
remove the test file also in case gdb isn't there, to not leave
garbage behind.
---
 test/T050-new.sh | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/test/T050-new.sh b/test/T050-new.sh
index beeb574a3b30..2bc799d2e2bc 100755
--- a/test/T050-new.sh
+++ b/test/T050-new.sh
@@ -298,4 +298,38 @@ output=$(NOTMUCH_NEW --debug 2>&1 | sed 's/: .*$//' )
 chmod u+w  ${MAIL_DIR}/.notmuch/xapian/*.${db_ending}
 test_expect_equal "$output" "A Xapian exception occurred opening database"
 
+
+test_begin_subtest "Handle files vanishing between scandir and add_file"
+
+# A file for scandir to find. It won't get indexed, so can be empty.
+touch ${MAIL_DIR}/vanish
+
+# Breakpoint to remove the file before indexing
+cat <<EOF > notmuch-new-vanish.gdb
+set breakpoint pending on
+set logging file notmuch-new-vanish-gdb.log
+set logging on
+break add_file
+commands
+shell rm -f ${MAIL_DIR}/vanish
+continue
+end
+run
+EOF
+
+gdb --batch-silent --return-child-result -x notmuch-new-vanish.gdb \
+    --args notmuch new 2>OUTPUT 1>/dev/null
+echo "exit status: $?" >> OUTPUT
+
+# Clean up the file in case gdb isn't available.
+rm -f ${MAIL_DIR}/vanish
+
+cat <<EOF > EXPECTED
+Unexpected error with file ${MAIL_DIR}/vanish
+add_file: Something went wrong trying to read or write a file
+Error opening ${MAIL_DIR}/vanish: No such file or directory
+exit status: 75
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 test_done
-- 
2.1.4